appearances

Five Nights at Freddy's 2

"An animatronic known as RWQFSFASXC, or Shadow Bonnie, can occasionally be seen standing on the left side of the office. Looking at RWQFSFASXC for too long will cause your game to crash.” — The Freddy Files, page 43

On rare occasions, when the player lowers the Monitor, RWQFSFASXC has 1/1,000,000 (0.0001%) chance to appear standing on the left side of the Office where Golden Freddy normally sits. At first, he doesn't seem hostile and cannot jumpscare, but if the player does nothing but staring at him for at least 4 seconds, he will appear to fade away like Golden Freddy and crash the game (or directly sends the player back to the main menu in console ports).

There are three ways to prevent RWQFSFASXC from crashing the game:

Immediately wear the Freddy Fazbear Head.
Pull up the Monitor. This is the same similar strategy of preventing Golden Freddy from attacking in the first Five Nights at Freddy's game.
Shine the Flashlight.

Five Nights at Freddy's 3

Shadow Bonnie returns in Five Nights at Freddy's 3 in a very minor role. He only appears in the minigames but not ingame itself.

In the end-of-night minigame after beating Night 4, RWQFSFASXC can be seen standing inside the right-side box in the West Hall screen. This refers to a hidden figurine of a dark-colored Toy Bonnie figurine that stands on the player's desk on Night 5. Double-clicking this figurine triggers the "Glitch" minigame.

To make him fly infinitely, the player must press the W button. RWQFSFASXC will phase-shift or glitch through various minigame vignettes as well as a unique purple room that can be triggered by the S key. While playing as RWQFSFASXC in the "Glitch" minigame, the player must complete either of the two endings:

In the basic ending, RWQFSFASXC ventures through the room, and exits through the door.
In the cake ending, RWQFSFASXC can go to the BB's Air Adventure section of this minigame and leave the room in the top-left. Phasing over to the purple room with the crying ghost child while RWQFSFASXC is outside of the room allows him to contact the child. If the player has unlocked prior Cake Ending criteria, touching the crying child will make a cake appear, exiting the minigame and unlocking a child on the Happiest Day minigame.

Ultimate Custom Night

RWQFSFASXC finally makes a return in Ultimate Custom Night as one of the several non-selectable characters summoned by Dee Dee.

After being summoned by Dee Dee, he will appear in the Office and emit thick black fog which will cover the entire Office for about 10 seconds, with any animatronic in the Office still visible, however. This makes the player unable to see the doors or vent doors, forcing them to keep track of what is open and closed through other means.

Five Nights at Freddy's VR: Help Wanted

In the Curse of Dreadbear DLC for Five Nights at Freddy's VR: Help Wanted, RWQFSFASXC's cardboard cutout can be found in the Afraid of the Dark mode's "Corn Maze" segment.

Five Nights at Freddy's AR: Special Delivery

RWQFSFASXC receives a big role in Five Nights at Freddy's AR: Special Delivery. He will only spawn if enough Shadow Remnants are collected, and, unlike in previous games, he is completely hostile. After spawning, the player must shine their Flashlight at RWQFSFASXC to repel him. The player must do multiple rounds of repelling him before he finally is defeated. His difficulty permanently increases after each time he is beaten, increasing the amount of rounds he can last and increasing his disruption strength and frequency, until it finally reaches a point where he is completely impossible to defeat. RWQFSFASXC slowly walks towards the player each time he appears, and if the player is too slow to shine their light on him, he will attack the player, resulting in failure.

Defeating him will reward the player with more Remnants and a streak, while losing to him breaks the player's current streak and removes a varying amount of Remnants from the player (typically 10-25).